Means for removing broken stud bolts



July-28, 192 5.

, W. J. MURPHREE [MEANS FOR REMOVING BROKEN STUD BOLTS Filed June 17.1924 Patented July 28, 1925.

. UNITED STATES WILLIE 'J. munrnnnn, or En cniv'rno, CALIFORNIA.

mmns ronnnmovrue Baoxnn .s run BOLTS.

Application filed June 17, 1924. Serial No. 720,627.

To all whom it may ,Be-i kno n t at I, WILLJE J- a citizen of the UnitedStates, residingat,

El Centro, in the county of Imperial and State of California, haveinvented certain new and useful Improvements in a Means for RemovingBroken Stud Bolts, of which the following is a specification.

This invention relates ,to new and useful improvements in a means forremoving broken stud bolts and has for its principal object to provide ameans which will efgciently and positively remove a broken stud olt.

Another important object of the invention is to provide a means forremoving broken stud bolts and is especially adapted for use inconjunction with the removal of broken stud bolts from a cylinder block.

A still further object of the invention is to provide a means of theabove mentioned character, which is simple in construction, inexpensive,strong and durable and furthermore adapted for the purposes for which itis designated. I

A still further object is to provide a means for removing broken studbolts of the above mentioned character which may be readily and easilyused and will further save considerable time in extracting broken studbolts.

Other objects and advantages of this invention will become apparentduring the course of the following description.

In the accompanying drawing forming a part of this specification and inwhich like numerals designate like parts throughout the same:

Figure 1 is a detail perspective view of my improved tool;

Fig. 2 is a view partlyin section and part ly in side elevation, showingthe manner in which the tool is used in forming the grooves in the innerwall of a broken stud bolt which is threaded in a cylinder block; and

Fig. 3 is a bottom plan view of my improved tool.

In the drawing wherein for the purpose of illustration is shown thepreferred embodiment of my invention, thenumeral l designates generallymy improved tool and the same comprises the cylindrical shank portion,the lower portion of which is provided with longitudinally extendingspaced grooves 3 whereby the longitudinal ribs 4 are formed thereby. Thebottom of the tool is drilled to form the substantially concaved porti0nwh reby utting ed es 6 are formed on the lower edgesof thelongitudinally extending ribsi, the purpose of which will be hereinaftermore fully des ri d.-

The upper end of the shank portion 2 of the tool 1 is provided with thesquare head 7 whereby a means is provided for the reception of a wrenchor other similar tool to facilitate the rotation of the tool whenremoving a broken stud bolt.

In removing broken stud bolts, the stud bolt A which is threaded in thecylinder block B in the manner'well known in the art has an openingdrilled in the top thereof, it being understood of course that the.

hole or opening 8 is of a diametb slightly less than the diameter of thebolt extracting tool. The tool 1 is then placed over the opening 8 so asto have the cutting edges 6 resting on the top of the bolt A. The toolis then struck with a hammer on the head ,7 thereof so that the cuttingedges 6 will cut into the upper portion of the stud bolt and form aplurality of vertical spaced grooves in the. inner wall of the brokenstud bolt simultaneously causing the ribs 4: on the lower edges of whichare formed the cutting edges 6 to be received in the longitudinalgrooves formed by the cutting edges. The portions of the stud bolts Awhich are cut away in forming the grooves in the inner wall of the boltare illustrated at 9 in Fig. 2 of the drawing.

After the tool has been driven down into the stud bolt for a suitabledistance so that the rib 4 will beseated in the longitudinal grooves inthe broken stud bolt the wrench or other suitable tool is placed inengagement with the square head 7 on the upper end of the tool and byturning the tool in the proper direction, the coacting ribs and grooveswill cause the broken stud bolt to be entirely removed from threadedengagement with its support.

It will'thus be seen from the foregoing description, that a simple andefficient means has been provided whereby broken stud bolts may bereadily and easily removed without the loss of time or labor. It is ofcourse to be understood that the tool used in removing broken stud boltsis constructed of any suitable material, preferably hardened tool steel.Further a tool of this character may be employed in connection witheither left or right threaded bolts.

While I have shown the preferred embodiment of my invention, it is to beunderstood that various changes in the size, shape and arrangementofparts may be resorted to without departing from the spirit of the in-Vention and the scope of the appended claim.

Having thus described the invention, What I claim is A tool for removingbroken stud bolts, the latter having an opening formed in the topthereof, said tool comprising a shank portion of greater diameter thanthe diameter of the opening, longitudinally spaced ribs on the outerportion of the shank, the

bottom of the tool being substantially concaved forming cutting edges onthe lower edges of the ribs for engaging the end of WILLIE J. MURPHREE.

